LEGO Working Fake Engine with smallest valves on YouTube reving to 4000+ rpm

I made an engine out of LEGO fake engine parts again...

00:00 - Introduction
00:36 - Flywheel No.1 - Medium
01:53 - Flywheel No.2 - Heavy
03:34 - Flywheel No.3 - Light

Recently i have seen people using tire valves to make those engines work.
So I decided to try this for myself...
But I tried to improve on the designs i found, by modifying my valves to be able to fit them in a smaller valvebody...

It should theoretically not be possible to create smaller valves, as this type of engine requires the air volume inside the brick to work. And the tile on top is the smallest way to get air towards the valve core...

That said... Maybe I'll try to shorten the valve body by one tile height in the future...
Sadly, as of right now I only have 4 working valves, so a V4 is the best i can do...

I don't own a rpm measuring device that measures rpm this high, but I did a FFT on the engine sound with the light flywheel. If I'm not mistaken I was able to measure about 6500 rpm according to the frequency of the engine sound.

Hope you like the video!